Linux – Terminal resizes itself

Non-printable sequences should be enclosed in \[ and \]. Looking at your PS1 it has a unenclosed sequence after \W. But, the second entry is redundant as well as it repeats the previous statement "1;34".

\[\033[01;32m\]\u:\[\033[01;34m\] \W\033[01;34m \$\[\033[00m\]
                  |_____________|               |_|
                         |                       |
                         +--- Let this apply to this as well.

As such this should have intended coloring:

\[\033[1;32m\]\u:\[\033[1;34m\] \W \$\[\033[0m\]
                               |_____|
                                  |
                                  +---- Bold blue.

Keeping the "original" this should also work:

\[\033[1;32m\]\u:\[\033[1;34m\] \W\[\033[1;34m\] \$\[\033[0m\]
                                  |_|         |_|
                                   |           |
                                   +-----------+-- Enclose in \[ \]

Edit:

The reason for the behavior is because bash believes the prompt is longer then it actually is. As a simple example, if one use:

PS1="\033[0;34m$"
       1 2345678

The prompt is believed to be 8 characters and not 1. As such if terminal window is 20 columns, after typing 12 characters, it is believed to be 20 and wraps around. This is also evident if one then try to do backspace or Ctrl+u. It stops at column 9.

However it also does not start new line unless one are on last column, as a result the first line is overwritten.

If one keep typing the line should wrap to next line after 32 characters.