Add inline find bar as an alternative to the floating find/replace panel

Previously, Cmd+F opened a floating NSPanel (MMFindReplaceController).
This commit introduces an optional inline find bar (MMFindBarView) that
appears as an overlay anchored to the top-right corner of the text area,
similar to the find bar in VS Code and other modern editors.

The inline mode is controlled by a new "Find bar: Inline" preference in
the General pane (off by default, preserving existing behaviour).

Changes:
- Add MMFindBarView: a programmatic NSView overlay with find/replace
  fields, Ignore Case / Match Word checkboxes, Replace / Replace All /
  Previous / Next buttons, and an MMHoverButton close button styled to
  match the tab close button
- The bar is freely draggable within the text-editing area and snaps to
  the top-right corner only on first show; subsequent Cmd+F presses
  preserve the user's dragged position
- Window resize and tab-bar show/hide keep the bar in place via a
  delta-based repositioning algorithm
- Add MMFindBarInlineKey user default and register it (default NO)
- Add "Find bar" toggle to the General preferences pane
- Route ShowFindReplaceDialogMsgID to the inline bar or the floating
  panel depending on the preference (MMVimController)
- Add -sendFindBarAction:findString:replaceString:ignoreCase:matchWord:
  to MMWindowController to unify search message dispatch for both modes;
  fix IBAction tag-to-FRD-flags mapping (tag 2→flags 3, tag 3→flags 4)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: valsong

src/MacVim/Base.lproj/Preferences.xib

@@ -8,6 +8,7 @@
     <objects>
         <customObject id="-2" userLabel="File's Owner" customClass="MMPreferenceController">
             <connections>
+                <outlet property="findBarInlineButton" destination="fBr-00-FB2" id="fBr-00-FB8"/>
                 <outlet property="advancedPreferences" destination="620" id="632"/>
                 <outlet property="allowForceClickLookUpButton" destination="rlt-zw-mfW" id="xCv-HS-zyJ"/>
                 <outlet property="appearancePreferences" destination="hr4-G4-3ZG" id="G54-DD-ACh"/>
@@ -24,11 +25,11 @@
         <customObject id="-3" userLabel="Application" customClass="NSObject"/>
         <userDefaultsController representsSharedInstance="YES" id="58" userLabel="Shared Defaults"/>
         <customView id="115" userLabel="General">
-            <rect key="frame" x="0.0" y="0.0" width="483" height="382"/>
+            <rect key="frame" x="0.0" y="0.0" width="483" height="407"/>
             <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
             <subviews>
                 <customView id="5x5-P0-afk" userLabel="Open untitled window">
-                    <rect key="frame" x="20" y="284" width="433" height="78"/>
+                    <rect key="frame" x="20" y="309" width="433" height="78"/>
                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                     <subviews>
                         <textField focusRingType="none" verticalHuggingPriority="750" horizontalCompressionResistancePriority="250" id="117">
@@ -77,7 +78,7 @@
                     </subviews>
                 </customView>
                 <customView id="p6o-fo-STi" userLabel="Open files from applications">
-                    <rect key="frame" x="20" y="144" width="433" height="132"/>
+                    <rect key="frame" x="20" y="169" width="433" height="132"/>
                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                     <subviews>
                         <textField focusRingType="none" verticalHuggingPriority="750" horizontalCompressionResistancePriority="250" id="116">
@@ -156,7 +157,7 @@
                     </subviews>
                 </customView>
                 <customView id="dlz-JQ-U4e" userLabel="After last window closes">
-                    <rect key="frame" x="20" y="114" width="381" height="22"/>
+                    <rect key="frame" x="20" y="139" width="381" height="22"/>
                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                     <subviews>
                         <textField focusRingType="none" verticalHuggingPriority="750" horizontalCompressionResistancePriority="250" id="126">
@@ -189,7 +190,7 @@
                     </subviews>
                 </customView>
                 <customView id="6BL-o0-OrR" userLabel="Window Resizing">
-                    <rect key="frame" x="20" y="89" width="444" height="17"/>
+                    <rect key="frame" x="20" y="114" width="444" height="17"/>
                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                     <subviews>
                         <button id="f9h-8n-asD" userLabel="allow smooth resizing">
@@ -216,6 +217,34 @@
                         </textField>
                     </subviews>
                 </customView>
+                <customView id="fBr-00-FB1" userLabel="Find Bar">
+                    <rect key="frame" x="20" y="89" width="444" height="17"/>
+                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
+                    <subviews>
+                        <button id="fBr-00-FB2" userLabel="findBarInlineButton">
+                            <rect key="frame" x="188" y="-1" width="285" height="18"/>
+                            <autoresizingMask key="autoresizingMask" flexibleMinY="YES"/>
+                            <string key="toolTip">Shows an inline find/replace bar anchored to the top-right corner of the editor, instead of a floating dialog box.</string>
+                            <buttonCell key="cell" type="check" title="Use inline find bar (top-right overlay)" bezelStyle="regularSquare" imagePosition="left" alignment="left" inset="2" id="fBr-00-FB3">
+                                <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
+                                <font key="font" metaFont="system"/>
+                            </buttonCell>
+                            <connections>
+                                <action selector="findBarModeChanged:" target="-2" id="fBr-00-FB4"/>
+                                <binding destination="58" name="value" keyPath="values.MMFindBarInline" id="fBr-00-FB5"/>
+                            </connections>
+                        </button>
+                        <textField focusRingType="none" verticalHuggingPriority="750" horizontalCompressionResistancePriority="250" id="fBr-00-FB6" userLabel="Find bar">
+                            <rect key="frame" x="-2" y="0.0" width="187" height="17"/>
+                            <autoresizingMask key="autoresizingMask" flexibleMinY="YES"/>
+                            <textFieldCell key="cell" sendsActionOnEndEditing="YES" alignment="right" title="Find bar:" id="fBr-00-FB7">
+                                <font key="font" metaFont="system"/>
+                                <color key="textColor" name="controlTextColor" catalog="System" colorSpace="catalog"/>
+                                <color key="backgroundColor" name="controlColor" catalog="System" colorSpace="catalog"/>
+                            </textFieldCell>
+                        </textField>
+                    </subviews>
+                </customView>
                 <customView id="nRD-BI-GeM" userLabel="Launch behavior">
                     <rect key="frame" x="20" y="64" width="444" height="17"/>
                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>

src/MacVim/MMAppController.m

@@ -233,6 +233,7 @@ + (void)registerDefaults
         @"",                              MMLastUsedBundleVersionKey,
         [NSNumber numberWithBool:YES],    MMShowWhatsNewOnStartupKey,
         [NSNumber numberWithBool:0],      MMScrollOneDirectionOnlyKey,
+        [NSNumber numberWithBool:NO],     MMFindBarInlineKey,
         nil];
 
     [ud registerDefaults:macvimDefaults];

src/MacVim/MMFindBarView.h

@@ -0,0 +1,37 @@
+/* vi:set ts=8 sts=4 sw=4 ft=objc:
+ *
+ * VIM - Vi IMproved		by Bram Moolenaar
+ *				MacVim GUI port by Bjorn Winckler
+ *
+ * Do ":help uganda"  in Vim to read copying and usage conditions.
+ * Do ":help credits" in Vim to see a list of people who contributed.
+ * See README.txt for an overview of the Vim source code.
+ */
+
+#import <Cocoa/Cocoa.h>
+
+
+@class MMFindBarView;
+
+@protocol MMFindBarViewDelegate <NSObject>
+- (void)findBarView:(MMFindBarView *)view findNext:(BOOL)forward;
+- (void)findBarView:(MMFindBarView *)view replace:(BOOL)replaceAll;
+- (void)findBarViewDidClose:(MMFindBarView *)view;
+// Returns the rect (in MMFindBarView's superview coordinates) within which the
+// bar may be dragged.  Typically this is the text-view frame, excluding the
+// tabline and scrollbars.
+- (NSRect)findBarViewDraggableBounds:(MMFindBarView *)view;
+@end
+
+
+@interface MMFindBarView : NSView <NSTextFieldDelegate>
+
+@property (nonatomic, assign) id<MMFindBarViewDelegate> delegate;
+
+- (void)showWithText:(NSString *)text flags:(int)flags;
+- (NSString *)findString;
+- (NSString *)replaceString;
+- (BOOL)ignoreCase;
+- (BOOL)matchWord;
+
+@end