From 8e779b6e858d8ac8263cf7b0bb760d422f1cf979 Mon Sep 17 00:00:00 2001
From: David Lawrence Ramsey <pooka109@gmail.com>
Date: Sun, 13 Aug 2017 04:30:10 -0500
Subject: [PATCH] softwrap: properly update the viewport when adding text at
firstcolumn
Adding text plus whitespace while the cursor is at or near the topleft
corner of the edit window can cause a change in the preceding chunk,
throwing firstcolumn out of alignment. Catch this special case.
This fixes http://savannah.gnu.org/bugs/?51743.
---
src/nano.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/src/nano.c b/src/nano.c
index 150fc6d1..7307925f 100644
--- a/src/nano.c
+++ b/src/nano.c
@@ -1855,6 +1855,15 @@ void do_output(char *output, size_t output_len, bool allow_cntrls)
if (openfile->mark_set && openfile->current == openfile->mark_begin &&
openfile->current_x < openfile->mark_begin_x)
openfile->mark_begin_x += char_len;
+
+ /* When the cursor is on the top row and not on the first chunk
+ * of a line, adding text there might change the preceding chunk
+ * and thus require an adjustment of firstcolumn. */
+ if (openfile->current == openfile->edittop &&
+ openfile->firstcolumn > 0) {
+ ensure_firstcolumn_is_aligned();
+ refresh_needed = TRUE;
+ }
#endif
openfile->current_x += char_len;
--
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