patch 9.0.1019: 'smoothscroll' and virtual text above don't work togetherv9.0.1019

Problem:    'smoothscroll' and virtual text above don't work together.
            (Yee Cheng Chin)
Solution:   Skip virtual text above when w_skipcol is non-zero.
            (closes #11665)

1 files changed, 69 insertions, 38 deletions

diff --git a/src/drawline.c b/src/drawline.c
index bde5ec8247..804b1005af 100644
--- a/src/drawline.c
+++ b/src/drawline.c
@@ -637,7 +637,8 @@ text_prop_position(
 	int	    *n_extra,	    // nr of bytes for virtual text
 	char_u	    **p_extra,	    // virtual text
 	int	    *n_attr,	    // attribute cells, NULL if not used
-	int	    *n_attr_skip)   // cells to skip attr, NULL if not used
+	int	    *n_attr_skip,   // cells to skip attr, NULL if not used
+	int	    do_skip)	    // skip_cells is not zero
 {
     int	    right = (tp->tp_flags & TP_FLAG_ALIGN_RIGHT);
     int	    above = (tp->tp_flags & TP_FLAG_ALIGN_ABOVE);
@@ -690,6 +691,8 @@ text_prop_position(
 		    else
 			n_used = *n_extra;
 		}
+		else if (below && before > vcol && do_skip)
+		    before -= vcol;
 		else
 		    before = 0;
 	    }
@@ -1500,15 +1503,75 @@ win_line(
 	area_highlighting = TRUE;
     }
 
+    // When w_skipcol is non-zero and there is virtual text above the actual
+    // text, then this much of the virtual text is skipped.
+    int skipcol_in_text_prop_above = 0;
+
 #ifdef FEAT_PROP_POPUP
     if (WIN_IS_POPUP(wp))
 	wlv.screen_line_flags |= SLF_POPUP;
+
+    char_u *prop_start;
+    text_prop_count = get_text_props(wp->w_buffer, lnum, &prop_start, FALSE);
+    if (text_prop_count > 0)
+    {
+	// Make a copy of the properties, so that they are properly
+	// aligned.
+	text_props = ALLOC_MULT(textprop_T, text_prop_count);
+	if (text_props != NULL)
+	    mch_memmove(text_props, prop_start,
+				     text_prop_count * sizeof(textprop_T));
+
+	// Allocate an array for the indexes.
+	text_prop_idxs = ALLOC_MULT(int, text_prop_count);
+	if (text_prop_idxs == NULL)
+	    VIM_CLEAR(text_props);
+
+	if (text_props != NULL)
+	{
+	    area_highlighting = TRUE;
+	    extra_check = TRUE;
+
+	    // When skipping virtual text the props need to be sorted.  The
+	    // order is reversed!
+	    if (lnum == wp->w_topline && wp->w_skipcol > 0)
+	    {
+		for (int i = 0; i < text_prop_count; ++i)
+		    text_prop_idxs[i] = i;
+		sort_text_props(wp->w_buffer, text_props,
+					      text_prop_idxs, text_prop_count);
+	    }
+
+	    // Text props "above" move the line number down to where the text
+	    // is.  Only count the ones that are visible, not those that are
+	    // skipped because of w_skipcol.
+	    int text_width = wp->w_width - win_col_off(wp);
+	    for (int i = text_prop_count - 1; i >= 0; --i)
+		if (text_props[i].tp_flags & TP_FLAG_ALIGN_ABOVE)
+		{
+		    if (lnum == wp->w_topline
+			    && wp->w_skipcol - skipcol_in_text_prop_above
+								 >= text_width)
+		    {
+			// This virtual text above is skipped, remove it from
+			// the array.
+			skipcol_in_text_prop_above += text_width;
+			for (int j = i + 1; j < text_prop_count; ++j)
+			    text_props[j - 1] = text_props[j];
+			++i;
+			--text_prop_count;
+		    }
+		    else
+			++wlv.text_prop_above_count;
+		}
+	}
+    }
 #endif
 
     // 'nowrap' or 'wrap' and a single line that doesn't fit: Advance to the
     // first character to be displayed.
     if (wp->w_p_wrap)
-	v = startrow == 0 ? wp->w_skipcol : 0;
+	v = startrow == 0 ? wp->w_skipcol - skipcol_in_text_prop_above : 0;
     else
 	v = wp->w_leftcol;
     if (v > 0 && !number_only)
@@ -1559,7 +1622,8 @@ win_line(
 #ifdef FEAT_PROP_POPUP
 	// If there the text doesn't reach to the desired column, need to skip
 	// "skip_cells" cells when virtual text follows.
-	if (!wp->w_p_wrap && v > wlv.vcol)
+	if ((!wp->w_p_wrap || (lnum == wp->w_topline && wp->w_skipcol > 0))
+							       && v > wlv.vcol)
 	    skip_cells = v - wlv.vcol;
 #endif
 
@@ -1703,40 +1767,6 @@ win_line(
     }
 #endif
 
-#ifdef FEAT_PROP_POPUP
-    {
-	char_u *prop_start;
-
-	text_prop_count = get_text_props(wp->w_buffer, lnum,
-							   &prop_start, FALSE);
-	if (text_prop_count > 0)
-	{
-	    // Make a copy of the properties, so that they are properly
-	    // aligned.
-	    text_props = ALLOC_MULT(textprop_T, text_prop_count);
-	    if (text_props != NULL)
-		mch_memmove(text_props, prop_start,
-					 text_prop_count * sizeof(textprop_T));
-
-	    // Allocate an array for the indexes.
-	    text_prop_idxs = ALLOC_MULT(int, text_prop_count);
-	    if (text_prop_idxs == NULL)
-		VIM_CLEAR(text_props);
-
-	    if (text_props != NULL)
-	    {
-		area_highlighting = TRUE;
-		extra_check = TRUE;
-		// text props "above" move the line number down to where the
-		// text is.
-		for (int i = 0; i < text_prop_count; ++i)
-		    if (text_props[i].tp_flags & TP_FLAG_ALIGN_ABOVE)
-			++wlv.text_prop_above_count;
-	    }
-	}
-    }
-#endif
-
     win_line_start(wp, &wlv, FALSE);
 
     // Repeat for the whole displayed line.
@@ -2059,7 +2089,8 @@ win_line(
 						    wlv.vcol,
 						    wlv.col,
 						    &wlv.n_extra, &wlv.p_extra,
-						    &n_attr, &wlv.n_attr_skip);
+						    &n_attr, &wlv.n_attr_skip,
+						    skip_cells > 0);
 				if (wlv.p_extra != prev_p_extra)
 				{
 				    // wlv.p_extra was allocated