Add more flexible options for window positioning (#630)

New configuration option for g:tagbar_position that will supercede g:tagbar_left. This option allows for new values for 'top', 'bottom', 'left' and 'right' (default:'right') to position the Tagbar window.

New configuration option for g:tagbar_height that will supercede g:tagbar_vertical. This option is used to set the Tagbar window height when the window is split using the 'top' or 'bottom' position.

New configuration option for g:tagbar_no_status_line. This option will disable any Tagbar status line updates in the event another plugin is controlling the status line. This prevents Tagbar from changing the status line when Tagbar is not the active window.

Co-authored-by: David Hegland <david.hegland@broadcom.com>

autoload/tagbar.vim

@@ -879,14 +879,21 @@ function! s:OpenWindow(flags) abort
     endif
 
     let s:window_opening = 1
-    if g:tagbar_vertical == 0
+    if g:tagbar_position =~# '\v(bottom|right)'
+        let openpos = 'rightbelow '
+    else
+        let openpos = 'leftabove '
+    endif
+    if g:tagbar_position =~# '\v(left|right)'
         let mode = 'vertical '
-        let openpos = g:tagbar_left ? 'topleft ' : 'botright '
         let width = g:tagbar_width
     else
         let mode = ''
-        let openpos = g:tagbar_left ? 'leftabove ' : 'rightbelow '
-        let width = g:tagbar_vertical
+        if g:tagbar_height > 0
+            let width = g:tagbar_height
+        else
+            let width = g:tagbar_vertical
+        endif
     endif
     exe 'silent keepalt ' . openpos . mode . width . 'split ' . s:TagbarBufName()
     exe 'silent ' . mode . 'resize ' . width
@@ -2287,7 +2294,7 @@ function! s:ShowInPreviewWin() abort
     " We want the preview window to be relative to the file window in normal
     " (horizontal) mode, and relative to the Tagbar window in vertical mode,
     " to make the best use of space.
-    if g:tagbar_vertical == 0
+    if g:tagbar_position !~# '\v(top|bottom)'
         call s:GotoFileWindow(taginfo.fileinfo, 1)
         call s:mark_window()
     endif
@@ -2298,7 +2305,7 @@ function! s:ShowInPreviewWin() abort
         silent execute
             \ g:tagbar_previewwin_pos . ' pedit ' .
             \ fnameescape(taginfo.fileinfo.fpath)
-        if g:tagbar_vertical != 0
+        if g:tagbar_position =~# '\v(top|bottom)'
             silent execute 'vertical resize ' . g:tagbar_width
         endif
         " Remember that the preview window was opened by Tagbar so we can
@@ -2306,7 +2313,7 @@ function! s:ShowInPreviewWin() abort
         let s:pwin_by_tagbar = 1
     endif
 
-    if g:tagbar_vertical != 0
+    if g:tagbar_position =~# '\v(top|bottom)'
         call s:GotoFileWindow(taginfo.fileinfo, 1)
         call s:mark_window()
     endif
@@ -2946,6 +2953,7 @@ function! s:ExecuteCtags(ctags_cmd) abort
     else
         let py_version = get(g:, 'tagbar_python', 1)
         silent let ctags_output = s:run_system(a:ctags_cmd, py_version)
+        redraw!
     endif
 
     if &shell =~? 'cmd\.exe'
@@ -3199,7 +3207,7 @@ endfunction
 " s:SetStatusLine() {{{2
 function! s:SetStatusLine() abort
     let tagbarwinnr = bufwinnr(s:TagbarBufName())
-    if tagbarwinnr == -1
+    if tagbarwinnr == -1 || exists('g:tagbar_no_status_line')
         return
     endif