[gimp] Bug 777589 - explains GIF animation's minimum framerate.

[Jehan Pagès <jehanp src gnome org>]

commit e83383c3208355aae2c12da06a5832bcfa23a02a
Author: Jehan <jehan girinstud io>
Date:   Mon Jan 23 19:23:57 2017 +0100

    Bug 777589 - explains GIF animation's minimum framerate.
    
    Though we display the frame delay as milliseconds, it is actually stored
    as unsigned centiseconds in GIF. This means that displaying milliseconds
    can be misleading since we round every value to tens and it also means
    that 10ms is the lower delay allowed. This limitation is in the GIF
    format.
    Other animation formats may not have this limitation and we try and keep
    consistent export UIs. Also the layer tagging for animation uses "ms"
    syntax. So I just keep the delay entry as ms, but sets a lower allowed
    value and makes it "snaps to ticks" (i.e. snaps to 10 ms increments).
    Finally I add a tooltip to the field saying "GIF supports hundredths of
    a second precision."
    Hopefully this should make things clearer and not mislead people about
    what the GIF format allows.

 plug-ins/ui/plug-in-file-gif.ui |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/plug-ins/ui/plug-in-file-gif.ui b/plug-ins/ui/plug-in-file-gif.ui
index d09cc9c..f47eb1b 100644
--- a/plug-ins/ui/plug-in-file-gif.ui
+++ b/plug-ins/ui/plug-in-file-gif.ui
@@ -158,6 +158,7 @@
                         <property name="label" translatable="yes">_Delay between frames where 
unspecified:</property>
                         <property name="use_underline">True</property>
                         <property name="mnemonic_widget">delay-spin</property>
+                        <property name="tooltip-text" translatable="yes">GIF supports hundredths of a second 
precision.</property>
                       </object>
                       <packing>
                         <property name="expand">False</property>
@@ -173,6 +174,8 @@
                         <property name="shadow_type">none</property>
                         <property name="adjustment">delay</property>
                         <property name="climb_rate">1</property>
+                        <property name="snap-to-ticks">True</property>
+                        <property name="tooltip-text" translatable="yes">GIF supports hundredths of a second 
precision.</property>
                       </object>
                       <packing>
                         <property name="expand">False</property>
@@ -287,6 +290,7 @@
   </object>
   <object class="GtkAdjustment" id="delay">
     <property name="value">100</property>
+    <property name="lower">10</property>
     <property name="upper">65000</property>
     <property name="step_increment">10</property>
     <property name="page_increment">100</property>