From 9cf535759e6c64ab0ba62fe83a36048aab3f3fbe Mon Sep 17 00:00:00 2001
From: Martin <laz.git@mfriebe.de>
Date: Fri, 24 Sep 2021 22:00:25 +0200
Subject: [PATCH] SynEdit: Linenumber gutter, "Every Nth Line" must be 1 or
 greater. Issue #39394

---
 components/synedit/syngutterlinenumber.pp | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/components/synedit/syngutterlinenumber.pp b/components/synedit/syngutterlinenumber.pp
index 18f79cf5d6..41dd0778a7 100644
--- a/components/synedit/syngutterlinenumber.pp
+++ b/components/synedit/syngutterlinenumber.pp
@@ -142,7 +142,7 @@ procedure TSynGutterLineNumber.SetShowOnlyLineNumbersMultiplesOf(const AValue :
 begin
   If FShowOnlyLineNumbersMultiplesOf <> AValue then
   begin
-    FShowOnlyLineNumbersMultiplesOf := AValue;
+    FShowOnlyLineNumbersMultiplesOf := Max(AValue, 1);
     DoChange(self);
   end;
 end;
@@ -236,7 +236,7 @@ var
   s: string;
   dc: HDC;
   LineInfo: TSynEditGutterLineInfo;
-  LineHeight: Integer;
+  LineHeight, EveryNLine: Integer;
   t: TLinePos;
 
 begin
@@ -269,6 +269,7 @@ begin
     // prepare the rect initially
     rcLine := AClip;
     rcLine.Bottom := AClip.Top;
+    EveryNLine := Max(ShowOnlyLineNumbersMultiplesOf, 1);
     for i := t + FirstLine to t + LastLine do
     begin
       iLine := ToPos(ViewedTextBuffer.DisplayView.ViewToTextIndexEx(i, LineInfo.LineRange));
@@ -278,7 +279,7 @@ begin
       // Must show a dot instead of line number if
       // line number is not the first, the last, the current line
       // or a multiple of ShowOnlyLineNumbersMultiplesOf
-      LineInfo.ShowDot := ((iLine mod ShowOnlyLineNumbersMultiplesOf) <> 0)
+      LineInfo.ShowDot := ((iLine mod EveryNLine) <> 0)
           and (iLine <> SynEdit.CaretY) and (iLine <> 1)
           and (iLine <> SynEdit.Lines.Count);
       // Get the formatted line number or dot