Fix issue with app beachballing when connecting from external URL (#2903)

Let’s hope this won’t break on older OS versions now…

Author: dmoagx

Interfaces/English.lproj/ConnectionView.xib

@@ -64,7 +64,7 @@
         </customObject>
         <customObject id="-1" userLabel="First Responder" customClass="FirstResponder"/>
         <customObject id="-3" userLabel="Application" customClass="NSObject"/>
-        <customView wantsLayer="YES" id="5739" userLabel="ConnectionView" customClass="SPFlippedView">
+        <customView id="5739" userLabel="ConnectionView" customClass="SPFlippedView">
             <rect key="frame" x="0.0" y="0.0" width="882" height="513"/>
             <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
             <subviews>
@@ -261,7 +261,7 @@
                                                 <rect key="frame" x="0.0" y="0.0" width="681" height="480"/>
                                                 <autoresizingMask key="autoresizingMask" widthSizable="YES"/>
                                                 <subviews>
-                                                    <customView id="4888" customClass="NSCustomView">
+                                                    <customView wantsLayer="YES" id="4888" customClass="NSCustomView">
                                                         <rect key="frame" x="116" y="5" width="446" height="472"/>
                                                         <autoresizingMask key="autoresizingMask" flexibleMinX="YES" flexibleMaxX="YES" flexibleMinY="YES" flexibleMaxY="YES"/>
                                                         <subviews>

Source/SPConnectionController.m

@@ -58,6 +58,7 @@
 #endif
 #import "SPSplitView.h"
 #import "SPColorSelectorView.h"
+#import "SPFunctions.h"
 
 #import <SPMySQL/SPMySQL.h>
 
@@ -1931,8 +1932,15 @@ - (void)_startEditingConnection
 	[editButtonsView setAlphaValue:0.0f];
 	[editButtonsView setHidden:NO];
 	[editButtonsView setFrameOrigin:NSMakePoint([editButtonsView frame].origin.x, [editButtonsView frame].origin.y - 30)];
-	[[editButtonsView animator] setFrameOrigin:NSMakePoint([editButtonsView frame].origin.x, [editButtonsView frame].origin.y + 30)];
-	[[editButtonsView animator] setAlphaValue:1.0f];
+	// The animation is started async because there is a bug/oddity with layer-backed views and animating frameOrigin (at least in 10.13):
+	// If both calls to -setFrameOrigin: are in the same method, CA would only animate the difference between those calls (which is 0 here).
+	// This works fine when not using layers, but then there is another issue with the progress indicator (#2903)
+	SPMainLoopAsync(^{
+		[NSAnimationContext beginGrouping];
+		[[editButtonsView animator] setFrameOrigin:NSMakePoint([editButtonsView frame].origin.x, [editButtonsView frame].origin.y + 30)];
+		[[editButtonsView animator] setAlphaValue:1.0f];
+		[NSAnimationContext endGrouping];
+	});
 
 	// Update the "Save" button state as appropriate
 	[saveFavoriteButton setEnabled:([self selectedFavorite] != nil)];
@@ -2975,6 +2983,13 @@ - (void)scrollViewFrameChanged:(NSNotification *)aNotification
 	// Otherwise, center
 	else {
 		connectionDetailsFrame.origin.y = (scrollViewFrame.size.height - connectionDetailsFrame.size.height)/3;
+		// the division may lead to values that are not valid for the current screen size (e.g. non-integer values on a
+		// @1x non-retina screen). The OS works something out when not using layer-backed views, but in the latter
+		// case the result will look like garbage if we don't fix this.
+		// This code is taken from Apple's "BlurryView" example code.
+		connectionDetailsFrame = [[connectionDetailsScrollView superview] convertRectToBase:connectionDetailsFrame];
+		connectionDetailsFrame.origin.y = round(connectionDetailsFrame.origin.y);
+		connectionDetailsFrame = [[connectionDetailsScrollView superview] convertRectFromBase:connectionDetailsFrame];
 		[connectionResizeContainer setFrame:connectionDetailsFrame];
 		scrollDocumentFrame.size.height = scrollViewFrame.size.height;
 		[[connectionDetailsScrollView documentView] setFrame:scrollDocumentFrame];

Source/SPFunctions.h

@@ -35,6 +35,12 @@
  */
 void SPMainQSync(void (^block)(void));
 
+/**
+ * Asynchronously execute a block on the main run loop.
+ * This function is equivalent to calling -[[NSRunLoop mainRunLoop] performBlock:] on 10.12+
+ */
+void SPMainLoopAsync(void (^block)(void));
+
 /**
  * Copies count bytes into buf provided by caller
  * @param buf Base address to copy to

Source/SPFunctions.m

@@ -42,6 +42,12 @@ void SPMainQSync(void (^block)(void))
 	}
 }
 
+void SPMainLoopAsync(void (^block)(void))
+{
+	NSArray *modes = @[NSDefaultRunLoopMode];
+	CFRunLoopPerformBlock(CFRunLoopGetMain(), modes, block);
+}
+
 int SPBetterRandomBytes(uint8_t *buf, size_t count)
 {
 	if([SPOSInfo isOSVersionAtLeastMajor:10 minor:7 patch:0]) {