From bd58bdf4763890f9f86ed20dbf15aac30f21b03b Mon Sep 17 00:00:00 2001
From: OmrSi <OmrSi97@gmail.com>
Date: Fri, 16 Oct 2020 17:42:35 +0300
Subject: [PATCH] Allow controls in measurement converter

---
 src/Forms/MeasurementConverter.cs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Forms/MeasurementConverter.cs b/src/Forms/MeasurementConverter.cs
index d7fbb93f7..59526f8b6 100644
--- a/src/Forms/MeasurementConverter.cs
+++ b/src/Forms/MeasurementConverter.cs
@@ -4793,12 +4793,12 @@ namespace Nikse.SubtitleEdit.Forms
 
         private void textBoxInput_KeyPress(object sender, KeyPressEventArgs e)
         {
-            if (char.IsDigit(e.KeyChar))
+            if (char.IsControl(e.KeyChar) || char.IsDigit(e.KeyChar))
             {
                 return;
             }
 
-            if (e.KeyChar == Convert.ToChar(Keys.Back) || e.KeyChar == '.' || e.KeyChar == ',' || e.KeyChar == '-')
+            if (e.KeyChar == '.' && !((sender as TextBox).Text.IndexOf('.') > -1) || e.KeyChar == ',' || e.KeyChar == '-' && !((sender as TextBox).Text.IndexOf('-') > -1))
             {
                 return;
             }