Make the input flat

[alainm23]

Fixed #275

[ryonakano]

It looks like the replace_text handler no longer working with this branch.

This branch:

Latest origin/main (479cc48):

[ryonakano]

I see the following critical warnings on the terminal:

(io.elementary.calculator:8416): GLib-GObject-CRITICAL **: 13:11:24.552: invalid (NULL) pointer instance

(io.elementary.calculator:8416): GLib-GObject-CRITICAL **: 13:11:24.552: g_signal_connect_object: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed

And these warnings are out at src/MainWindow.vala:474 according to gdb:

user@elementary-8:~/work/calculator$ G_DEBUG=fatal-criticals gdb io.elementary.calculator 
:

(io.elementary.calculator:8889): GLib-GObject-CRITICAL **: 13:14:54.928: invalid (NULL) pointer instance

Thread 1 "io.elementary.c" received signal SIGTRAP, Trace/breakpoint trap.
0x00007ffff7ec56a1 in g_logv () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
(gdb) bt
#0  0x00007ffff7ec56a1 in g_logv () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007ffff7ec5953 in g_log () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007ffff7e3d5aa in g_type_check_instance () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#3  0x00007ffff7e251a9 in g_signal_connect_object () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#4  0x00005555555677fb in pantheon_calculator_main_window_constructor (type=Python Exception <class 'gdb.error'>: No type named TypeNode.
, n_construct_properties=5, construct_properties=0x7fffffffcf60) at ../src/MainWindow.vala:474

[alainm23]

Sorry, I didn't know about that feature. I went back to using Gtk.Entry and applied CSS instead.