patch 9.1.0184: Cursor pos wrong when clicking with conceal and wrap

Problem:  Cursor position wrong when clicking with conceal and wrap.
Solution: Use the virtual column of the last char for ScreenCols[] in
          boguscols.  Remove use of MAXCOL in ScreenCols[].  Rename
          third argument of wlv_screen_line() to "clear_end" as that's
          clearer what it does (zeertzjq).

related: 14192
closes: #14200

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/mouse.c b/src/mouse.c
index e5f0687..af14af0 100644
--- a/src/mouse.c
+++ b/src/mouse.c
@@ -2098,35 +2098,7 @@
 	    redraw_cmdline = TRUE;	// show visual mode later
     }
 
-    if (col_from_screen == MAXCOL)
-    {
-	// When clicking after end of line, still need to set correct curswant
-	int off_l = LineOffset[prev_row] + curwin->w_wincol;
-	if (ScreenCols[off_l] < MAXCOL)
-	{
-	    // Binary search to find last char in line
-	    int off_r = LineOffset[prev_row] + prev_col;
-	    int off_click = off_r;
-	    while (off_l < off_r)
-	    {
-		int off_m = (off_l + off_r + 1) / 2;
-		if (ScreenCols[off_m] < MAXCOL)
-		    off_l = off_m;
-		else
-		    off_r = off_m - 1;
-	    }
-	    colnr_T eol_vcol = ScreenCols[off_r];
-	    if (eol_vcol < 0)
-		// Empty line or whole line before w_leftcol,
-		// with columns before buffer text
-		eol_vcol = curwin->w_leftcol - 1;
-	    col = eol_vcol + (off_click - off_r);
-	}
-	else
-	    // Empty line or whole line before w_leftcol
-	    col = prev_col - curwin->w_wincol + curwin->w_leftcol;
-    }
-    else if (col_from_screen >= 0)
+    if (col_from_screen >= 0)
     {
 	// Use the virtual column from ScreenCols[], it is accurate also after
 	// concealed characters.