patch 8.1.1719: popup too wide when 'showbreak' is set

Problem:    Popup too wide when 'showbreak' is set.
Solution:   Set window width when computing line length. (closes #4701)

src/popupwin.c

@@ -971,9 +971,16 @@ popup_adjust_position(win_T *wp)
     wp->w_width = 1;
     for (lnum = wp->w_topline; lnum <= wp->w_buffer->b_ml.ml_line_count; ++lnum)
     {
-	// count Tabs for what they are worth
-	int len = win_linetabsize(wp, ml_get_buf(wp->w_buffer, lnum, FALSE),
+	int len;
+	int w_width = wp->w_width;
+
+	// Count Tabs for what they are worth and compute the length based on
+	// the maximum width (matters when 'showbreak' is set).
+	if (wp->w_width < maxwidth)
+	    wp->w_width = maxwidth;
+	len = win_linetabsize(wp, ml_get_buf(wp->w_buffer, lnum, FALSE),
 							      (colnr_T)MAXCOL);
+	wp->w_width = w_width;
 
 	if (wp->w_p_wrap)
 	{

src/testdir/dumps/Test_popupwin_showbreak.dump

@@ -0,0 +1,10 @@
+>1+0&#ffffff0| @73
+|2| @73
+|3| @73
+|4| @25|╔+0#0000001#ffd7ff255|═@17|╗| +0#0000000#ffffff0@27
+|5| @25|║+0#0000001#ffd7ff255| |a| |l|o|n|g| |l|i|n|e| |h|e|r|e| |║| +0#0000000#ffffff0@27
+|6| @25|╚+0#0000001#ffd7ff255|═@17|╝| +0#0000000#ffffff0@27
+|7| @73
+|8| @73
+|9| @73
+@57|1|,|1| @10|T|o|p| 

src/testdir/test_popupwin.vim

@@ -717,6 +717,27 @@ func Test_popup_without_wrap()
   call delete('XtestPopup')
 endfunc
 
+func Test_popup_with_showbreak()
+  if !CanRunVimInTerminal()
+    throw 'Skipped: cannot make screendumps'
+  endif
+  let lines =<< trim END
+	 set showbreak=>>\ 
+	 call setline(1, range(1, 20))
+	 let winid = popup_dialog(
+	   \ 'a long line here',
+	   \ #{filter: 'popup_filter_yesno'})
+  END
+  call writefile(lines, 'XtestPopupShowbreak')
+  let buf = RunVimInTerminal('-S XtestPopupShowbreak', #{rows: 10})
+  call VerifyScreenDump(buf, 'Test_popupwin_showbreak', {})
+
+  " clean up
+  call term_sendkeys(buf, "y")
+  call StopVimInTerminal(buf)
+  call delete('XtestPopupShowbreak')
+endfunc
+
 func Test_popup_time()
   if !has('timers')
     throw 'Skipped: timer feature not supported'
@@ -2162,4 +2183,4 @@ func Test_previewpopup()
   call delete('XtestPreviewPopup')
 endfunc
 
-" vim: shiftwidth=2 sts=2 expandtab
+" vim: shiftwidth=2 sts=2

src/version.c

@@ -777,6 +777,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1719,
 /**/
     1718,
 /**/