The f1 tempfile must always be created. Even if the initial diff has no objects on the left side, the view can be switched to a different diff which does have objects on both sides. When that happened, tog crashed. (To reproduce: open tog in got.git, hit G, hit Enter, hit <)

error was tog/tog.c:636: warning: function declaration isn't a prototype

the vborder is drawn on top of the window and that can cause issues with double-width characters. Instead, account for it when computing the space available for the log message. ok stsp@

drawing the child view on top of the main view when the layout is split-screen can produce some ugly glitches when double-width characters are involved. (issue found by stsp) ok stsp@

generalize scroll_wline to start at a specified offset so that we can reuse it to simplify format_line. While here, simplify scroll_wline (now called span_wline) too. ok and improvements by stsp@

found by op@ ok op@ tracey@

ok op@

ok op@

ok op@

ok op@

ok tb@