Use standalone non-breaking spaces in upper window

Prevents the occasional collapsing of space-only lines. Closes #17

Author: dcsch

Yazmin/GridStoryFacet.m

@@ -83,6 +83,13 @@ - (void)setCursorLine:(int)line column:(int)column {
 }
 
 - (void)print:(NSString *)text {
+
+  // If a standalone space, convert it to a non-breaking space so
+  // that the text system doesn't get any ideas about collapsing it
+  if ([text isEqualToString:@" "]) {
+    const unichar nbsp = 0xa0;
+    text = [NSString stringWithCharacters:&nbsp length:1];
+  }
   [self.textStorage beginEditing];
 
   // Break into individual lines

Yazmin/ZMachine.mm

@@ -63,10 +63,6 @@ - (instancetype)initWithStory:(Story *)aStory {
       if (0 < len && len <= kMaxStorySize) {
         parts->_memory =
             new ZMMemory((const uint8_t *)data.bytes, len, *parts->_io);
-
-        // parts->_memory->getDictionary().dump();
-        // parts->_memory->getHeader().dump();
-        // parts->_memory->dump();
       }
 
       parts->_error = new ZMErrorAdapter(story);

YazminTests/StatusLineTests.m

@@ -69,37 +69,38 @@ - (void)tearDown {
 }
 
 - (void)testTimeStatus {
+  // Note that the following string tests contain non-breaking spaces
   Story *story = [[Story alloc] init];
   [story readFromData:data ofType:@"" error:nil];
   story.facets[1].widthInCharacters = 40;
   story.facets[1].heightInLines = 1;
   [story showStatus];
   XCTAssertEqualObjects(story.facets[1].textStorage.string,
-                        @" foo                           2:03 AM  ");
+                        @" foo                           2:03 AM  ");
 
   [story.zMachine setGlobal:8 atIndex:1];
   [story.zMachine setGlobal:0 atIndex:2];
   [story showStatus];
   XCTAssertEqualObjects(story.facets[1].textStorage.string,
-                        @" foo                           8:00 AM  ");
+                        @" foo                           8:00 AM  ");
 
   [story.zMachine setGlobal:0 atIndex:1];
   [story.zMachine setGlobal:11 atIndex:2];
   [story showStatus];
   XCTAssertEqualObjects(story.facets[1].textStorage.string,
-                        @" foo                           12:11 AM ");
+                        @" foo                           12:11 AM ");
 
   [story.zMachine setGlobal:12 atIndex:1];
   [story.zMachine setGlobal:11 atIndex:2];
   [story showStatus];
   XCTAssertEqualObjects(story.facets[1].textStorage.string,
-                        @" foo                           12:11 PM ");
+                        @" foo                           12:11 PM ");
 
   [story.zMachine setGlobal:111 atIndex:1];
   [story.zMachine setGlobal:99 atIndex:2];
   [story showStatus];
   XCTAssertEqualObjects(story.facets[1].textStorage.string,
-                        @" foo                           99:99 PM ");
+                        @" foo                           99:99 PM ");
 
   [story close];
 }