Fix misc CoreText rendering bugs and issues with clipping and composing characters

runtime/doc/gui_mac.txt

@@ -290,6 +290,7 @@ KEY				VALUE ~
 *MMNoTitleBarWindow*		hide title bar [bool]
 *MMTitlebarAppearsTransparent*	enable a transparent titlebar [bool]
 *MMAppearanceModeSelection*	dark mode selection (|macvim-dark-mode|)[bool]
+*MMRendererClipToRow*		clip tall characters to the row they are on [bool]
 *MMSmoothResize*		allow smooth resizing of MacVim window [bool]
 *MMShareFindPboard*		share search text to Find Pasteboard [bool]
 *MMShowAddTabButton*		enable "add tab" button on tabline [bool]

runtime/doc/tags

@@ -5498,6 +5498,7 @@ MMNoFontSubstitution	gui_mac.txt	/*MMNoFontSubstitution*
 MMNoTitleBarWindow	gui_mac.txt	/*MMNoTitleBarWindow*
 MMNonNativeFullScreenSafeAreaBehavior	gui_mac.txt	/*MMNonNativeFullScreenSafeAreaBehavior*
 MMNonNativeFullScreenShowMenu	gui_mac.txt	/*MMNonNativeFullScreenShowMenu*
+MMRendererClipToRow	gui_mac.txt	/*MMRendererClipToRow*
 MMShareFindPboard	gui_mac.txt	/*MMShareFindPboard*
 MMShowAddTabButton	gui_mac.txt	/*MMShowAddTabButton*
 MMSmoothResize	gui_mac.txt	/*MMSmoothResize*

src/MacVim/Base.lproj/Preferences.xib

@@ -425,8 +425,8 @@
                         <button id="A48-s0-kdR" userLabel="Preserve Line Spacing">
                             <rect key="frame" x="189" y="-1" width="244" height="18"/>
                             <autoresizingMask key="autoresizingMask" flexibleMinY="YES"/>
-                            <string key="toolTip">Some fonts have non-standard built-in line spacings (anything other than 1). If this is checked, MacVim will use the font's specified line spacing to calculate line height. Otherwise, it will just set it to 1, which helps if you would like a more compact spacing without having to install another font.</string>
-                            <buttonCell key="cell" type="check" title="Preserve font line spacing" bezelStyle="regularSquare" imagePosition="left" alignment="left" inset="2" id="SeR-yl-Gtz" userLabel="Preserve Line Spacing">
+                            <string key="toolTip">macOS can sometimes use a conservative approach to calculating line spacing for a font (by setting a 1.2 line spacing). This could potentially lead to line spacing feeling too wide. Unchecking this will use a tighter calculation and use a 1.0 line spacing instead.</string>
+                            <buttonCell key="cell" type="check" title="Use macOS line spacing calculation" bezelStyle="regularSquare" imagePosition="left" alignment="left" inset="2" id="SeR-yl-Gtz" userLabel="Preserve Line Spacing">
                                 <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
                                 <font key="font" metaFont="system"/>
                             </buttonCell>

src/MacVim/MMAppController.m

@@ -260,6 +260,7 @@ + (void)initialize
         [NSNumber numberWithBool:YES],    MMShareFindPboardKey,
         [NSNumber numberWithBool:NO],     MMSmoothResizeKey,
         [NSNumber numberWithBool:NO],     MMCmdLineAlignBottomKey,
+        [NSNumber numberWithBool:NO],     MMRendererClipToRowKey,
         [NSNumber numberWithBool:YES],    MMAllowForceClickLookUpKey,
         [NSNumber numberWithBool:NO],     MMUpdaterPrereleaseChannelKey,
         nil];

src/MacVim/MMCoreTextView.h

@@ -12,6 +12,8 @@
 
 @class MMTextViewHelper;
 
+NS_ASSUME_NONNULL_BEGIN
+
 
 /// The main text view that manages drawing Vim's content using Core Text, and
 /// handles input. We are using this instead of NSTextView because of the
@@ -84,7 +86,7 @@
 //
 // NSFontChanging methods
 //
-- (void)changeFont:(id)sender;
+- (void)changeFont:(nullable id)sender;
 
 //
 // NSMenuItemValidation
@@ -100,7 +102,7 @@
 - (IBAction)paste:(id)sender;
 - (IBAction)undo:(id)sender;
 - (IBAction)redo:(id)sender;
-- (IBAction)selectAll:(id)sender;
+- (IBAction)selectAll:(nullable id)sender;
 
 //
 // MMTextStorage methods
@@ -186,3 +188,5 @@
 @interface MMCoreTextView (ToolTip)
 - (void)setToolTipAtMousePoint:(NSString *)string;
 @end
+
+NS_ASSUME_NONNULL_END

src/MacVim/Miscellaneous.h

@@ -61,6 +61,7 @@ extern NSString *MMNonNativeFullScreenShowMenuKey;
 extern NSString *MMNonNativeFullScreenSafeAreaBehaviorKey;
 extern NSString *MMSmoothResizeKey;
 extern NSString *MMCmdLineAlignBottomKey;
+extern NSString *MMRendererClipToRowKey;
 extern NSString *MMAllowForceClickLookUpKey;
 extern NSString *MMUpdaterPrereleaseChannelKey;
 

src/MacVim/Miscellaneous.m

@@ -57,6 +57,7 @@
 NSString *MMNonNativeFullScreenSafeAreaBehaviorKey = @"MMNonNativeFullScreenSafeAreaBehavior";
 NSString *MMSmoothResizeKey               = @"MMSmoothResize";
 NSString *MMCmdLineAlignBottomKey         = @"MMCmdLineAlignBottom";
+NSString *MMRendererClipToRowKey      = @"MMRendererClipToRow";
 NSString *MMAllowForceClickLookUpKey      = @"MMAllowForceClickLookUp";
 NSString *MMUpdaterPrereleaseChannelKey   = @"MMUpdaterPrereleaseChannel";